code: def test_is_unique(self, numeric_indexing_engine_type_and_dtype):
      engine_type, dtype = numeric_indexing_engine_type_and_dtype
  
      # unique
      arr = np.array([1, 3, 2], dtype=dtype)
      engine = engine_type(arr)
      assert engine.is_unique is True
  
      # not unique
      arr = np.array([1, 2, 1], dtype=dtype)
      engine = engine_type(arr)
      assert engine.is_unique is False
  
file_path: pandas/pandas/tests/indexes/test_engines.py
imports: import re
  import numpy
  import pytest
  from pandas._libs import index
  import pandas
label_desc: Use image node_id 2 for calling the TestNumericEngine obj's underlying member method code with example usage: obj.test_is_unique(numeric_indexing_engine_type_and_dtype) without return types